X-Cash Core Blockchain

⛓ X-CASH is a community driven and open-source project developing the new standard of digital payment. Unique blockchain network with public and private transactions, custom DPOS consensus, and soon sidechains.

⚠ We are switching from CryptoNight PoW consensus algorithm to our own Delegated-Proof-of-Private-Stake (DPOPS) !
👉 Follow the development on the xcash-dpops repository.

Table of Content

• Table of Content
• Features
• License
• Contributing
• Documentation
• Security
• Installation
• Important Links

Features

Based and improved upon the renowned CryptoNote protocol, X-Cash aims at becoming the standard in digital payment and transaction settlement:

FlexPrivacy

X-Cash proposes the flexibility to send a transaction privately or publicly, directly from your wallet by toggling a simple switch, without compromising your privacy.

Have a look at our 📜 Hybrid Transactions' yellow paper to learn more about the technology behind it.

Delegated Proof of Private Stake (DPOPS)

To tackle scalability and future upgrades while reducing the energy comsuption of the network, we are developing a customized and unique DPOS consensus that can be implemented in any privacy coin.

Interested ? Read more about our 📜 Delegated Proof-of-Private-Stake yellow paper to learn more about the technical challenge of integrating this consensus on a Monero-based privacy coin.

Sidechains

Delegates will be able to host sidechains on the X-Cash network, providing an easy, secured, economical and customizable blockchain solution to match your project needs.

License

X-Cash is an open-source project managed by the X-Cash Foundation.
We are operating under the MIT License.

Contributing

Thank you for thinking of contributing! 😃
If you want to help out, check CONTRIBUTING for a set of guidelines and check our opened issues.

Documentation

We are hosting our documentation on GitBook 👉 docs.xcash.foundation

You can contribute directly on our gitbook-docs repository.

Security

If you discover a security vulnerability, please send an e-mail to [email protected].
All security vulnerabilities concerning the X-Cash blockchain will be promply addressed.

Installation

Dependencies

The following table summarizes the tools and libraries required to build.
A few of the libraries are also included in this repository (marked as "Vendored").

By default, the build uses the library installed on the system, and ignores the vendored sources. However, if no library is found installed on the system, then the vendored source will be built and used. The vendored sources are also used for statically-linked builds because distribution packages often include only shared library binaries (.so) but not static library archives (.a).

If you need to build statically linked linux binaries, please refer to Build Statically Linked Linux Binaries guide before you install any packages

Dep	Min. version	Vendored	Debian/Ubuntu pkg	Arch pkg	Fedora	Optional	Purpose
GCC	4.7.3	NO	build-essential	base-devel	gcc	NO
CMake	3.0.0	NO	cmake	cmake	cmake	NO
pkg-config	any	NO	pkg-config	base-devel	pkgconf	NO
Boost	1.58	NO	libboost-all-dev	boost	boost-devel	NO	C++ libraries
OpenSSL	basically any	NO	libssl-dev	openssl	openssl-devel	NO	sha256 sum
libzmq	3.0.0	NO	libzmq3-dev	zeromq	cppzmq-devel	NO	ZeroMQ library
libunbound	1.4.16	YES	libunbound-dev	unbound	unbound-devel	NO	DNS resolver
libsodium	?	NO	libsodium-dev	?	libsodium-devel	NO	libsodium
libminiupnpc	2.0	YES	libminiupnpc-dev	miniupnpc	miniupnpc-devel	YES	NAT punching
libunwind	any	NO	libunwind8-dev	libunwind	libunwind-devel	YES	Stack traces
liblzma	any	NO	liblzma-dev	xz	xz-devel	YES	For libunwind
libreadline	6.3.0	NO	libreadline6-dev	readline	readline-devel	YES	Input editing
ldns	1.6.17	NO	libldns-dev	ldns	ldns-devel	YES	SSL toolkit
expat	1.1	NO	libexpat1-dev	expat	expat-devel	YES	XML parsing
GTest	1.5	YES	libgtest-dev^	gtest	gtest-devel	YES	Test suite
Doxygen	any	NO	doxygen	doxygen	doxygen	YES	Documentation
Graphviz	any	NO	graphviz	graphviz	graphviz	YES	Documentation
pcsclite	?	NO	libpcsclite-dev	?	pcsc-lite pcsc-lite-devel	NO	Ledger

^ On Debian/Ubuntu, libgtest-dev only includes sources and headers. You must build the library binary manually. This can be done with the following command:

sudo apt-get install libgtest-dev && cd /usr/src/gtest && sudo cmake . && sudo make && sudo mv libg* /usr/lib/

Note: If you want to build with unit test (make instead of make release) you need libgtest to be compiled with fPIC. To do this, install libgtest using your package manager then run the following command to rebuild using fPIC:

cd /usr/src/gtest && sudo sed -i 's/CMAKE_CXX_FLAGS:STRING=/CMAKE_CXX_FLAGS:STRING=-fPIC/g' CMakeCache.txt && sudo sed -i 's/CMAKE_C_FLAGS:STRING=/CMAKE_C_FLAGS:STRING=-fPIC/g' CMakeCache.txt && sudo cmake . && sudo make && sudo mv libg* /usr/lib/

Cloning the repository

$ git clone https://github.com/X-CASH-official/xcash-core

Build instructions

X-CASH uses the CMake build system and a top-level makefile that invokes cmake commands as needed.

Linux and OS X

• Install the dependencies
• Change to the root of the source code directory and build:

cd X-CASH
make

Optional: If your machine has several cores and enough memory, enable parallel build by running make -j<number of threads> instead of make.
For this to be worthwhile, the machine should have one core and about 2GB of RAM available per thread.

Note: If cmake can not find zmq.hpp file on OS X, installing zmq.hpp from https://github.com/zeromq/cppzmq to /usr/local/include should fix that error.

• The resulting executables can be found in build/release/bin

• Add PATH="$PATH:$HOME/X-CASH/build/release/bin" to .profile

• Run X-CASH with xcash --detach

• (optional) Build and run the test suite to verify the binaries:

make release-test

Note: core_tests test may take a few hours to complete.

• (optional) To build binaries suitable for debugging:

make debug

• (optional) To build statically-linked binaries:

make release-static

Dependencies need to be built with -fPIC. Static libraries usually aren't, so you may have to build them yourself with -fPIC.
Refer to their documentation for how to build them, as well as refer to the Build Statically Linked Linux Binaries guide

Build Statically Linked Linux Binaries

Note: this guide is only for Ubuntu

• Only install the following packages from the package manager if you want to build statically linked linux binaries:

sudo apt update
sudo apt install -y build-essential cmake pkg-config libunbound-dev libsodium-dev libldns-dev libexpat1-dev doxygen graphviz
sudo apt-get -y install libgtest-dev && cd /usr/src/gtest && sudo cmake . && sudo make && sudo mv libg* /usr/lib/

• You will also need to install these additional packages

sudo apt install -y libsystemd-dev libudev-dev libtool-bin autoconf

• Download and extract the latest version of Boost, OpenSSL 1.1, PCSC-lite and libzmq

• Create build directories for boost, openssl and pcsclite. The reason these are not installed in the system directory is so you can keep your systems install, and have these at the same time. You can create these folders wherever and name them whatever.

mkdir BOOST_BUILD_DIR
mkdir OPENSSL_BUILD_DIR
mkdir PCSC_LITE_BUILD_DIR

• Install them:

• • boost

cd BOOST_DIRECTORY
./bootstrap.sh --prefix=BOOST_BUILD_DIR
sudo ./b2 cxxflags=-fPIC cflags=-fPIC -a install -j `nproc`

• • openssl

cd OPENSSL_DIRECTORY
./config -fPIC --prefix=OPENSSL_BUILD_DIR --openssldir=OPENSSL_BUILD_DIR
make depend
make -j `nproc`
sudo make install

• • pcsc-lite

cd PCSC-LITE_DIRECTORY
./configure CPPFLAGS=-DPIC CFLAGS=-fPIC CXXFLAGS=-fPIC LDFLAGS=-fPIC --enable-static --prefix=PCSC_LITE_BUILD_DIR
make -j `nproc`
sudo make install

• • libzmq

cd LIBZMQ_DIRECTORY
/autogen.sh
./configure CPPFLAGS=-DPIC CFLAGS=-fPIC CXXFLAGS=-fPIC LDFLAGS=-fPIC
make -j `nproc`
sudo make install
sudo ldconfig
cd /usr/local/include/
wget -q https://raw.githubusercontent.com/zeromq/cppzmq/master/zmq.hpp

• Now you can build the binaries statically using the following commands

cd X-CASH
rm -r build
mkdir -p build/release
cd build/release
cmake -D STATIC=ON -D ARCH="x86-64" -D BUILD_64=ON -D BUILD_TESTS=ON -D BOOST_ROOT=BOOST_BUILD_DIR -D OPENSSL_ROOT_DIR=OPENSSL_BUILD_DIR -D USE_READLINE=OFF -D CMAKE_BUILD_TYPE=release ../..
cd ../../
make -IBOOST_BUILD_DIR/include -IOPENSSL_BUILD_DIR/include -IPCSC_LITE_BUILD_DIR/include LDFLAGS="-LBOOST_BUILD_DIR/lib -LOPENSSL_BUILD_DIR/lib -LPCSC_LITE_BUILD_DIR/lib" -j `nproc`

Windows

Binaries are built on Windows using the MinGW toolchain within MSYS2 environment. The MSYS2 environment emulates a POSIX system. The toolchain runs within the environment and cross-compiles binaries that can run outside of the environment as a regular Windows application.

Preparing the build environment

• Download and install the MSYS2 installer, either the 64-bit or the 32-bit package, depending on your system.

• Open the MSYS shell via the MSYS2 Shell shortcut.

• Update packages using pacman:

pacman -Syuu

• Exit the MSYS shell using Alt+F4

• Edit the properties for the MSYS2 Shell shortcut changing "msys2_shell.bat" to "msys2_shell.cmd -mingw64" for 64-bit builds or "msys2_shell.cmd -mingw32" for 32-bit builds

• Restart MSYS shell via modified shortcut and update packages again using pacman:

pacman -Syuu

• Install dependencies:

• • Build for 64-bit Windows:

pacman -S mingw-w64-x86_64-toolchain make mingw-w64-x86_64-cmake mingw-w64-x86_64-boost mingw-w64-x86_64-openssl mingw-w64-x86_64-zeromq mingw-w64-x86_64-libsodium

• • Build for 32-bit Windows:

pacman -S mingw-w64-i686-toolchain make mingw-w64-i686-cmake mingw-w64-i686-boost mingw-w64-i686-openssl mingw-w64-i686-zeromq mingw-w64-i686-libsodium

• Open the MingW shell via MinGW-w64-Win64 Shell shortcut on 64-bit Windows or MinGW-w64-Win64 Shell shortcut on 32-bit Windows.

Note: If you are running 64-bit Windows, you will have both 64-bit and 32-bit MinGW shells.

Building

• For 64-bit system, run:

make release-static-win64

• For 32-bit system, run:

make release-static-win32

• The resulting executables can be found in build/release/bin

Building portable binaries

By default, in either dynamically or statically linked builds, binaries target the specific host processor on which the build happens and are not portable to other processors.

Build commands:

# Build binaries on Linux on x86_64 portable across POSIX systems on x86_64 processors
make release-static-linux-x86_64

# Builds binaries on Linux on x86_64 or i686 portable across POSIX systems on i686 processors
make release-static-linux-i686

# Builds binaries on Linux portable across POSIX systems on armv8 processors
make release-static-linux-armv8

# Builds binaries on Linux portable across POSIX systems on armv7 processors
make release-static-linux-armv7

# Builds binaries on Linux portable across POSIX systems on armv6 processors
make release-static-linux-armv6

# Builds binaries on 64-bit Windows portable across 64-bit Windows systems
make release-static-win64

# Builds binaries on 64-bit or 32-bit Windows portable across 32-bit Windows systems
make release-static-win32

Running xcashd daemon

The build places the binary in bin/ sub-directory within the build directory from which cmake was invoked (repository root by default). To run in foreground:

./bin/xcashd

To list all available options, run:

./bin/xcashd --help

Options can be specified either on the command line or in a configuration file passed by the --config-file argument. To specify an option in the configuration file, add a line with the syntax argumentname=value, where argumentname is the name of the argument without the leading dashes, for example log-level=1.

To run in background:

./bin/xcashd --log-file xcashd.log --detach

To run as a systemd service, copy xcashd.service to /etc/systemd/system/ and xcashd.conf to /etc/. The example service assumes that the user xcash exists and its home is the data directory specified in the example config.

If you're on Mac, you may need to add the --max-concurrency 1 option to xcash-wallet-cli, and possibly xcashd, if you get crashes refreshing.

Important Links

🔗 MAIN LINKS

• X-Network: x-network.io
• X-Cash: x-network.io/xcash
• Block explorer: explorer.x-cash.org
• Medium: medium.com/x-cash
• Help Center: Help Portal
• Mining: /xcash/mining/

👛 WALLET

• Download: Official Download Page
• Paper wallet: X-Cash Paper Wallet Generator
• Online wallet: X-Bank

💱 SUPPORTED EXCHANGES

• STEX: STEX.com
• GRAVIEX: graviex.net
• CITEX: citex.co.kr

🌍 COMMUNITY

• Twitter: @xcashcrypto
• Discord: discord.gg/4CAahnd
• BitcoinTalk: bitcointalk.org/index.php?topic=4781246
• Reddit: r/xcash/
• Telegram: t.me/xcashglobal